Sinusoidal alternating magnetic field generator with multiple magnetic field sources

Abstract

A sine alternating magnetic field generating device with multiple magnetic field sources comprises a single chip microcomputer, a high-order lowpass filtering circuit, a programmable gain amplification circuit, a radio frequency communication circuit, a power amplification circuit, a sequential control circuit, a resonance circuit, transmitting coils and a touch screen. Sine wave excitation signals are generated through the single chip microcomputer and the high-order lowpass filtering circuit; a plurality of transmitting coils are subject to time-sharing excitation through control of the sequential control circuit; and the power amplification circuit performs power amplification on the excitation signals so as to drive the transmitting coils to generate alternating magnetic fields in space. Output signals of a magnetic field sensor in a capsule endoscope are obtained according to the radio frequency communication circuit, a gain of the programmable gain amplification circuit is subject to adaptive adjustment through the single chip microcomputer, and accordingly magnetic field strength of the magnetic field sources in the magnetic field generating device is adjusted. By adopting the magnetic field generating device, real-time continuous tracking of the capsule endoscope placed in the human body can be achieved.

Description

technical field [0001] The invention relates to a medical device, in particular to a sinusoidal alternating magnetic field generating device with multiple magnetic field sources. Background technique [0002] Capsule endoscopy has greatly expanded the doctor's field of vision for gastrointestinal examination, filled the blind spots of gastroscope and colonoscopy, and solved the problems in the diagnosis of small intestinal diseases and gastrointestinal occult blood for many years. Compared with traditional medical endoscopes, capsule endoscopes have the advantages of simple operation, convenient inspection, no trauma, no pain, no cross-infection, and no influence on patients' normal work, especially for suspicious lesions of the small intestine. value. [0003] In the clinical application of capsule endoscopy, doctors often need to know the exact position of the capsule endoscope in the patient's body, but this cannot be obtained through direct methods, and the tracking and...

AI Technical Summary

Problems solved by technology

Since the volume of the magnetic marker is spatially limited by the internal space of the capsule endoscope, the strength of the magnetic field signal is limited. When the capsule endoscope is far away from the magnetic sensor, the magnetic sensor cannot distinguish weak signals, resulting in failure of positioning.

There is still a large gap between the measurement accuracy and detection distance of the magnetic marker positioning method reported so far and its practicability

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